and sanjay gupta m.d. >>> hey, there, thank you for joining us, this weekend we're marking world aids day. i want to point to this issue, if somebody has sex with a partner and doesn't tell them they have hiv, should they be punished? and if so how. and food trend, question is, would you really want a bite of this? but first, more than several million americans suffer from post-traumatic stress disorder. nightmares, to where a normal life can be impossible, also tough to treat. in fact, many that suffer are not helped by existing therapies. but there is new emerging research, pointing to a drug that most people simply know as ecstasy. >> some part of you is on guard. it just wouldn't stop, couldn't shut it down. >> for rachel hope the mental agony began in childhood, when she says she was abused and raped. for a grown-up, a familiar smell would bring it all back. >> i would get very extreme stabbing sensations in my body, and like fixed visuals, like being, for instance, raped. >> reporter: mental breakdowns, four times in the hospital. and along the way she tried almost every treatment in t